Leviticus 18:17-19

King James Version

¹⁷ Thou shalt not uncover the nakedness of a woman and her daughter, neither shalt thou take her son's daughter, or her daughter's daughter, to uncover her nakedness; for they are her near kinswomen: it is wickedness.

¹⁸ Neither shalt thou take a wife to her sister, to vex her, to uncover her nakedness, beside the other in her life time.

¹⁹ Also thou shalt not approach unto a woman to uncover her nakedness, as long as she is put apart for her uncleanness.